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Highway 17 Wildlife Crossing Plan

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Highway 17 Wildlife Crossing Plan Highway 17 Wildlife Crossing Plan Assessment of Solutions to Improve Traversability of State Highway 17 Dec ember 2012 Preface This plan was developed on behalf of the Midpeninsula Regional Open Space District to improve wildlife crossing across state highway 17, between Los Gatos and Lexington Hills. Several mountain lions, bobcats and deer have died along highway 17 due to collisions with vehicles. There are currently very few opportunities for wildlife to safely cross highway 17 along its entire length. This condition, combined with a concrete median barrier and high traffic levels means that highway 17 is a quantifiable barrier, isolating wildlife on the peninsula from the Central Coast and other eco-regions. This extremely significant ecological indication will cause local species endangerment, disruption of prey-predator relationships, and genetic/population fragmentation. Caltrans is conducting projects along highway 17 and thus can make improvements for wildlife crossing as part of these projects. This plan is intended to inform those project improvements. The Authors Tanya Diamond is the founder and co-owner of Connectivity for Wildlife, a research organization specializing in studying and re-connecting wildlife and landscape. Ms. Diamond received her MSc in Wildlife Biology from San Jose State University. Zara McDonald is the founder of Felidae Conservation Fund, a scientific research, education and conservation organization dedicated to the protection of in situ wild felid populations throughout the world. Fraser Shilling is a road ecologist at the University of California, Davis. He and his center, the Road Ecology Center, specialize in studying landscape connectivity and wildlife movement. Dr. Shilling received his PhD from the University of Southern California. 2 Table of Contents Preface .................................................................................................................................... 2 1. Highways & Medians ........................................................................................................... 4 2. Wildlife Movement and Mortality Data ............................................................................... 5 3. Fencing ................................................................................................................................ 8 4. Crossing Structures ............................................................................................................ 12 5. Priority Assessment: .......................................................................................................... 17 6. Funding .............................................................................................................................. 19 7. Monitoring Effectiveness .................................................................................................. 19 Appendices ............................................................................................................................ 20 3 1. Highways & Medians Median barriers are designed to separate opposing traffic. These barriers may be vegetated separators, guard-rails, concrete walls, or other structures. An unintended consequence of median barriers is that they inhibit wildlife movement across the surface of the roadway, but in the middle of the road, rather than the edge. This means that animals may become trapped in the median, or not try to cross at all because they can’t see across the road. At first, it might seem like a good thing if median barriers deter animals from entering the roadway. This is true from the individual point of view because they are less likely to become involved in a collision with a vehicle. However, if there are not other crossing alternatives above or below the road, animal populations may become separated from each other, or from essential reproductive, hibernation, foraging, or other habitat. In other words, median barriers can cause population reduction and loss when they prevent or severely inhibit animal movement across the road or highway right-of-way. Figure 1 Highway 17 median where puma was hit, east view. Existing Condition Within the study area, Highway 17 is a four lane highway with heavy traffic flow and volume (Table 1), as it is a commuter highway between the Bay Area and Santa Cruz. There is a concrete median that runs through the entire length of the linkage, except for a break at the Cats Restaurant entrance (Figures 1, 2, and 3). The median is approximately 4 feet high, and then increases in height to five feet tall near the top of the incline before the road levels off at Lexington reservoir. Table 1. Traffic volumes along highway 17 in study area Location (intersection) Peak vehicles/hour Average Annual Daily Travel (# vehicles) Highway 85 6,900 88,000 Santa Cruz Ave 5,000 64,000 Bear Creek Rd 4,400 56,000 Santa Clara Co. line 5,600 56,000 Granite Creek Rd 5,700 56,000 4 2. Wildlife Movement and Mortality Data There are many approaches for hypothesizing about connectivity (e.g., connectivity modeling in GIS), measuring connectivity among wildlife populations (e.g., genetic monitoring), observing live and dead wildlife occurrences, and measuring wildlife movement in the field (e.g., with radio-collars). Each of these methods provides some information about individuals and populations of wildlife species. None by itself provides sufficient information to plan and implement management practices to protect wildlife movement. For example, modeling in GIS provides an approximation or hypothesis about where wildlife might be moving, but only field measurements can confirm or test this hypothesis. Field observations can consist of roadkill or live animal observations, tracks & scat, or photographs from wildlife camera traps. Existing Condition There have been many animal road kills along Highway 17 over the past several years (Figure 2 & Table 2). Road kill data that has been collected by the Bay Area Puma Project, show that at each road kill site, there is no existing fence to keep animals from entering onto the highway or to detour them to a crossing structure, such as a culvert or bridge. Highway 17 Roadkill Sites and Crossing Structure locations on Puma Habitat Suitability map Bobcat Puma Puma Male Deer Male Puma Bobcat Bobcat µ 0 2.51.25 Legend Miles 1-2: strongly preferred 7-8: not breeding habitat,perhaps occasionally used Hwy 17 Crossing Strcutures 3-4: fair habitat 9-10: strongly avoided " Lexington Bridge 5-6: usable ! Lexington Culvert Figure 2. Hwy 17 Roadkill Sites & crossing structure locations on a Puma Habitat Suitability Map 5 In the north section of the linkage, which spans from the boundary of the linkage from downtown Los Gatos to the beginning of Lexington Reservoir to where Highway 17 levels out at Summit Rd, six mountain lions have been hit in the past five years. In addition to mountain lions, bobcat, deer, coyote, and other animals have been killed by cars on this roadway (figure 3). Figure 3. Reported roadkill in the California Roadkill Observation System. 6 ID Species Date Sex Travel Direction Location 2/9/2011 at adult Hwy 17, hit by ravine, with game trail 1 Puma 9:30 pm male southbound leading down to road 2 Puma southbound 3 Puma 8/29/2010 southbound 18 F was hit on Hwy 17 by Jarvis road, adult she was breeding and may have 4 Puma female been pregnant 16M was hit on Hwy 17 near the adult Glenwood cut off, on the east side 5 Puma male southbound heading west Puma was hit at the intersection of 6 Puma 10/1/2011 southbound Highway 17 & 85 Hwy 17 by the Cats Restaurant, 7 Puma 9-2011 southbound 8 Puma 10/15/2011 southbound Hwy 17 by Summit Road 1 Bobcat 2/10/2011 southbound near town of Los Gatos on Bear Creek off ramp direction of 2 Bobcat 5/17/2010 southbound travel: east on Hwy 17 near Alma Fire Station 3 Bobcat 7/19/2010 southbound direction of travel: east on Old Santa Cruz HWY near Alma Fire 4 Bobcat 10/2/2010 southbound Station direction of travel: east on Hwy 17 near Alma Fire Station 5 Bobcat 12/1/2010 northbound direction of travel EAST Hwy 17 by Lexington County Park, 6 Bobcat 8/15/2011 northbound where fence is down 7 Bobcat 12/13/2011 southbound Hwy 17 by Vasona Park, juvenile adult Hwy 17, hit 20 meters down from ravine 1 Deer 7/2/2011 male southbound where puma was hit on 2/9/2011 8/8/2011 at adult Hwy 17, by median across from Cats 2 Deer 8:30 pm female northbound restaurant By Lexington County Park, where the fence is down along the highway and deer often come down and graze by 3 Deer 11/28/2011 fawn northbound the side of the highway. adult Hwy 17 by Bear Creek Redwoods Open 4 Deer 11/24/2011 male southbound Space Preserve 5 Coyote 12/3/2011 northbound Hit by Lexington County Park road exit Table 2: Animal vehicle collisions-roadkill sites At the site where a mountain lion was hit on 2-9-2011 on Hwy 17 southbound, two ravines converge and there is no existing fencing (Figure 2, Figures A6-A9). Extensive game trails that lead to the ravine and toward the highway suggest this topographic feature leads animals to the highway (Figure A10). At the Trout Creek Culvert 2, puma, deer, bobcat, and deer have all been hit at this location, indicating that it is a high risk area for vehicle and animal collisions, as animals are moving down the ravine into the highway. 7 However, there is an extensive protected land network of Midpeninsula Regional Open Space District on either side of highway 17. Increasing permeability of the highway within this area would help facilitate animal movement
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